PURPOSE: To obtain a fireproof coating material causing expansion at a high rate by uniform foaming at the time of fire and exhibiting superior heat insulating property by incorporating a specified substance as a blowing aid into a fireproof coating material having a prescribed compsn. and giving a coating film convertible into a heat insulating covering layer by foaming at the time of a fire.
CONSTITUTION: Thermally expandable microcapsules (e.g. 'Matsumoto Microsphere F30(R)' made by Matsumoto Fats and Oils Pharm. Co. are incorporated as a blowing aid into a fireproof coating material consisting essentially of a thick aq. soln. of alkali silicate (e.g. No.3 sodium silicate) and a heat resistant inorg. filler (e.g. a silica powderwollastonite mixture) and giving a coating film convertible into a heat resistant covering layer by foaming at the time of a fire.
MASUYAMA HISAO
MORIYA MINEO
TASHIRO HAJIME
